Chapter 4: Changes around us

Q&A -Ask Doubts and Get Answers

Changes around us


A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?


A bag of cement gets wet due to rain. Once the bag gets wet, the cement reacts with moisture to form a hardened substance. This change cannot be reversed. 

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